Okay, here we have this:
Considering that the equation of a circle is:
(x-h)²+(y-k)²=r² with the center being at the point (h, k) and the radius being r.
Replacing we obtain:
(x-1)²+(y-(-4))²=2²
(x-1)²+(y+4)²=4
Finally we obtain that the correct answer is the option A.